Bandara, A.G.B.S.; Ginige, S.L.; Gajanayake, K.G.M.C.P.B.; Jayasundera, H.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2006)
Susantha, M.P.A.; Galahitiyawa, G.L.C.; Gajanayake, K.G.M.C.P.B.; Amarapana, W.M.U.A.B.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2006)